NABTEB Plumbing & Pipe Fitting 2024 Answers

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NABTEB 2024 PLUMBING & PIPE FITTING ANSWERS

PLUMBING OBJ
01-10: BDAAABCABD
11-20: ABDAACCBCA
21-30: CBADADCBAC
31-40: ACACCBADDC

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“`ANSWER FIVE QUESTIONS ONLY“`

(1a)
(i) Wear appropriate personal protective equipment (PPE) such as welding helmets, gloves, and safety glasses.
(ii) Ensure proper ventilation in the workshop to prevent inhalation of fumes and gases.
(iii) Keep flammable materials and sparks away from the welding area.
(iv) Ensure the welding machine is properly grounded and installed.
(v) Use proper welding techniques to avoid electrical shock and eye damage.
(vi) Keep a fire extinguisher nearby and ensure easy access to emergency services.

(1b)
(i) Connect the oxygen cylinder to the regulator.
(ii) Attach the acetylene cylinder to the regulator.
(iii) Connect the hoses to the regulators and torch.
(iv) Ensure all connections are secure and leak-free.
(v) Turn on the oxygen and acetylene supplies.
(vi) Adjust the regulators to achieve the proper flame.
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(2a)
[img]https://i.ibb.co/3Bvrrpy/Leftward-technique.jpg[/img]

(2b)
(i) Pressure reduction: Regulators reduce the high pressure of the gas cylinders (up to 2,000 psi) to a safe and usable pressure (typically 10-20 psi) for welding.
(ii) Flow control: Regulators control the flow rate of gas to the torch, ensuring a consistent and precise amount of gas is delivered.
(iii) Pressure stabilization: Regulators maintain a constant output pressure, despite changes in cylinder pressure or welding conditions.
(iv) Safety: Regulators prevent excessive gas flow, which can lead to fires or explosions.
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(3a)
(i) Water is a solvent:
Water is a solvent because it has the ability to dissolve a wide variety of substances, such as salts, sugars, and other polar compounds. This is due to its polar nature, which allows it to form hydrogen bonds with other molecules, making it an excellent dissolving agent.

(ii) Culpro-solvency:
Cupro-solvency refers to the ability of a solution to dissolve copper. Cupro-solvents are used to remove copper oxides and other copper compounds from surfaces. Cupro-solvency is important in various industries, such as electronics, where copper is used extensively.

(iii) Plumbio-solvency:
Plumbio-solvency refers to the ability of a solution to dissolve lead (plumbum in Latin). Plumbio-solvents are used to remove lead-based paints, coatings, and other lead compounds from surfaces. Plumbio-solvency is important in various industries, such as construction and renovation, where lead-based materials are present.

(3b)
[img]https://i.ibb.co/qgD3qhF/trap.jpg[/img][/url]
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(4)
[img]https://i.ibb.co/JnB9Jpf/two-pipe-system.jpg[/img]
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(5a)
=MERITS=
(i) Resistance to corrosion: PVC pipes are resistant to corrosion, making them durable and long-lasting.
(ii) Low maintenance: PVC pipes require minimal maintenance, as they are resistant to scaling and pitting.
(iii) Cost-effective: PVC pipes are generally cheaper than other materials, making them a cost-effective option.

=DEMERITS=
(i) Limited heat resistance: PVC pipes can degrade when exposed to high temperatures, making them unsuitable for hot water supply.
(ii) Prone to cracking: PVC pipes can crack and become brittle with age, leading to leaks and failures.
(iii) Environmental concerns: PVC production and disposal can have negative environmental impacts.

(5bi)
Surface Water:
-Rivers
-Lakes

(5bii)
Groundwater:
-Wells
-Boreholes

(5biii)
Rainwater Harvesting:
-Rainwater collected from roofs
-Rainwater stored in cisterns or tanks
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